Experimental Study of a Solar Adsorption Refrigeration Unit, Factorial Analysis
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REFERENCES
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Figure 14. Normal probability plots of the residuals (the re-
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there is no problem with the normality assumption except
for the upper tail that do not fall exactly along a straight
line passing through the center of the plot. However, no
outliers were seen, and then the normal probability plot
of the residuals is valid.
[5] D. I. Tchernev, “Solar Energy Cooling with Zéolithes,” Pro-
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4. Conclusions
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A flat-plate solar-powered refrigeration system was fab-
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From this study it was found that coconut shell’s acti-
vated carbon is better than palm seed’s and charcoal’s
because it provides the lowest refrigerator temperature
among the three adsorbers. From statistical analysis using
the general full factorial design it was found that both
factors (Adsorbent type and time) had a main effect on
both responses under study (the beds temperature and the
refrigerator temperature) during day and night cycles re-
spectively. It was also found that coconut shell has the
highest mean bed temperature during the day cycle of
77.5˚C, and has the lowest mean temperature during the
night cycle with 12.9˚C. There was no significance inter-
action between the variables of both factors. In addition, it
was found from the COP analysis that the coconut shell
activated carbon has the highest coefficient of perform-
ance of (0.31), followed by the palm seeds with a COP of
[9] Ph. Grenier, JJ. Guilleminot, M. Mester, F. Meunier and
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Cycle,” Proceedings of the ISES Conference, Perth, 1983.
[10] P. Worsoe-Schmidt, “Solar Refrigeration for Developing
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(0.30), and lastly the charcoal with a COP of (0.25).